Nothing has yet explained why MG2's Big Boss eats the dreams of war orphan children with glee, and that was the only question that isn't easy to connect the dots on.
It's pretty weird how this is a point in MGSV that completely flew passed Kojima's head despite the stars aligning for a huge villain defining moment for Big Boss, especially with the insane marketing materials tried to emphasize the child soldiers as if they were a bigger deal than they are.
Big Boss employs child soldiers for MSF already in Peace Walker? Check. Sure, it was prettied up with a T-rating and other than Chico, Paz wasn't a "child", but Ground Zeroes already went down a darker road and no one knew Paz wasn't a kid before the ending of PW.
Kaz states in TPP that he likes kids and that he's going to set them up for a normal life after Big Boss saves them? Check.
Eli informing Big Boss that the children escaped from Mother Base because battle is "all they know"? Check.
Knowing that Big Boss becomes a child-soldier utilizing villain and that somewhere along the road he'll have a rift with Kaz? Check.
Even with all the drama of bringing up child soldiers there's never any real drama by having them. Should have been a moment in the game where Big Boss realizes the usefulness of them and starts training them for combat instead. Not to mention, this would have hit
three birds with one stone. For one thing, the obvious tying together to Metal Gear 2. For the other, it'd actually be a good way for Kaz to start having reservations about Big Boss (and since Kojima is such a huge Breaking Bad fan, to draw a parallel here; it's like Jesse Pinkman being 110% against any people he works for exploiting or harming kids). Finally, and this is a point I haven't seen anyone suggest - it'd actually be the best possible way for Eli to start resenting Big Boss. Eli prides himself running his own little Kingdom of the Flies ordeal, but since battle is all those kids know, and since Big Boss is the best commander there is, what if the kids instead aligned themselves with Big Boss? Not only would this spark a more justified disdain in Eli against his dad, but it'd also be a good setup for Big Boss to have his "you're clearly the inferior one speech".
I can't believe that opportunity ran passed Kojima's head, and yet, somehow we're supposed to believe that the kids in MGSV are more belligerent than the adults are. Especially since Big Boss tried to emphasize that they were useful soldiers in MG2. After MGSV it boggles the mind that Big Boss could come to such a conclusion when those little shits were the only ones who questioned you out of the hundreds of faction soldiers you've fultoned throughout the game.